preposition
except for; unless there is/are 除了；除非
Barring accidents, we should arrive on time.
除非有意外情况，我们应可按时到达。
to ban or prevent sb from doing sth 禁止，阻止（某人做某事）
The players are barred from drinking alcohol the night before a match.
运动员在参赛前夜不得喝酒。